valuable brands. apple's brand value is at $153 billion. the agency says that the popularity of the ipod moved apple into first place. they took the top spot from gag couple is now at number two. ibm and mcdonald's are the top four. a worker at napa state hospital was attacked by a patient. last year a nurse was killed there. as john sasaki reports, the attack is causing fear in the employees. >> it is stressful out there. >> reporter: from the outside it looks peaceful and pretty. but inside, napa state hospital is anything but. >> there is no document that says you will be punched in the face, kicked, spit on, murdered, raped. you have no idea. you have no idea when you sign up for this. >> reporter: a psychiatric technician was attacked and beaten yesterday afternoon.